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Bahh.. any advice on what size hole saw to get?

post #1 of 4
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I wanting to drill 2x holes on my acrylic window for vga area intake fans. They're gonna be dual 92mm. What size whole saw should i get, i did some calculations.

92mm = 3.622 inches

Hole saws sizes are

3 5/8in = 3.625 inches = 92.074mm
3 1/2in = 3.5 inches = 88.9mm

Should i get the first one or the second one?

Also for cutting acrylic, should i get a bi-metal hole saw?
    
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post #2 of 4
i think the 3 5/8 is the best imo. difference is only to the thousandth of an inch. may be a hole "SLIGHTLY" bigger than 92 >_>..

i use a bi-metal hole saw. works perfectly fine. also handy if u need it for metal in the future
 
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post #3 of 4
bi-metal is good for metals an you can use it on acrylic, if you go slowly
normally for a 92mm fan people use a 3.5" hole saw

fan = holesaw
80mm = 3.0"
92mm = 3.5"
120mm = 4.5"

the 3 5/8 holesalw is slightly bigger than 3.5 but as long as it doesnt end up interfering with the screw holes you can use that if you like
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post #4 of 4
the reason for "slightly undersized" holesaws in that adjacent holes can be cut without them interfering with each other; also, the sizes match the actual diameters of the fan blades.
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